For some reason whenever I try and load a sample wav file from the USB Drive the MODX6 restarts itself and then keeps restarting until I remove the USB drive from the slot then it loads fine again.  It's not all the time this happens, but I would say the first time I try to access the USB it will restart, if I then try again the same operation it might be successful again.  I've tried with both USB drives I've formatted using the modx6 or drives that I formatted on my PC,

Does anyone have an idea of what could be the problem or seen this before?